When considering the 2021 BMW X6, potential buyers often find themselves torn between the 40i and M50i models. Both offer compelling performance, but for those prioritizing daily driving practicality alongside power, fuel economy becomes a crucial factor. This article delves into a fuel economy comparison between the BMW X6 40i, equipped with the B58 mild-hybrid engine, and the M50i, boasting the robust N63TU3 V8. Understanding the real-world fuel consumption differences is key to making an informed decision.
Engine Specs and Fuel Consumption Expectations
The BMW X6 40i features the B58 3.0-liter inline-6 turbocharged engine, enhanced with mild-hybrid technology for improved efficiency. This setup is known for its balance of power and relative fuel economy within its class. On the other hand, the X6 M50i is powered by the N63TU3 4.4-liter twin-turbo V8, delivering significantly more power and a distinct V8 engine note that many enthusiasts crave.
In terms of expected fuel consumption, it’s widely acknowledged that V8 engines generally consume more fuel than inline-6 engines. For city driving conditions, the original poster anticipates around 12-14 mpg (18-20 L/100 km) for the V8, which aligns with typical real-world figures for performance-oriented V8 SUVs. The question then becomes, how does the B58 in the X6 40i compare, and is the difference substantial?
Real-World Fuel Economy Differences
While official EPA estimates provide a baseline, real-world fuel economy often varies based on driving style and conditions. For drivers with a heavier foot on the gas pedal, as mentioned in the original post, achieving optimal fuel economy figures can be challenging.
Considering this, it’s reasonable to expect the BMW X6 40i with the B58 engine to offer better fuel economy than the M50i with the N63TU3 V8, especially in city driving. However, it’s important to manage expectations. The B58, while more efficient, is still powering a substantial SUV, and enthusiastic driving will diminish any fuel-saving advantages.
The crucial point is the difference in fuel consumption. While the X6 40i might achieve slightly better mpg figures, it’s unlikely to reach significantly higher numbers, especially for someone who describes themselves as “heavy on the gas.” If the concern is avoiding fuel consumption dramatically exceeding 12 mpg (20L/100km), both models might fall within a similar range in demanding city driving.
Conclusion: V8 Sound vs. Fuel Consumption Delta
Ultimately, the decision between the BMW X6 40i and M50i, when solely focused on fuel economy, hinges on the acceptable difference in consumption. If the fuel economy of the B58 is only marginally better in real-world conditions for a specific driver, and the allure of the V8 sound and increased power of the M50i is strong, the fuel consumption difference might be a worthwhile trade-off.
For those extremely sensitive to fuel costs or seeking the most economical option, the X6 40i will inherently be the more fuel-efficient choice. However, for those who prioritize the V8 experience and are prepared for a potentially slightly higher fuel bill, the M50i remains a compelling option, especially if the real-world fuel consumption gap is not dramatically significant in their typical driving scenarios. The key is to weigh the value of the V8 engine against the expected, and potentially not vast, difference in fuel economy.
